Citation: ZHANG Hai-Xin, CHEN Shu-Wei, CUI Xing-Yu, PAN Da-Hai, QIN Zhang-Feng, WANG Jian-Guo. Effect of Ce Promoter on Catalytic Performance of V/SiO₂ in Oxidative Dehydrogenation of Ethylbenzene with Carbon Dioxide[J]. Acta Physico-Chimica Sinica, ;2014, 30(2): 351-358. doi: 10.3866/PKU.WHXB201312021 shu

Effect of Ce Promoter on Catalytic Performance of V/SiO₂ in Oxidative Dehydrogenation of Ethylbenzene with Carbon Dioxide

1.
1 College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China;
2 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
3 Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, P. R. China

Received Date: 6 August 2013
Available Online: 2 December 2013
Fund Project: 国家自然科学基金(51172154)，山西省科技攻关项目(20130313001-3)，煤转化国家重点实验室开放课题基金(J12-13-603) (51172154)，山西省科技攻关项目(20130313001-3)，煤转化国家重点实验室开放课题基金(J12-13-603)山西省自然科学(青年)基金(2012021006-2)资助 (青年)基金(2012021006-2)

The effect of a Ce promoter on the catalytic properties of V/SiO₂ was investigated for the oxidative dehydrogenation of ethylbenzene (EB) to styrene (ST) with CO₂ (CO₂-ODEB). The catalysts were characterized by nitrogen adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H₂ temperature-programmed reduction (H₂-TPR), CO₂ temperature-programmed desorption (CO₂-TPD), and thermogravimetric analyses (TGA). It was found that incorporation of Ce into V/SiO₂ increased the dispersion of active V species, enhanced the redox properties of the system, and inhibited deep V reduction of V⁵⁺ to V³⁺ . The Ce promoter also improves the basicity of V/SiO₂ and CO₂ adsorption on the catalyst, and suppresses coke formation. The addition of a Ce promoter greatly improves the catalytic activity and stability of V/SiO₂ towards CO₂-ODEB. The ST yield and selectivity reach 55.6% and 98.5%, respectively, for CO₂-ODEB over the most efficient catalyst, V(0.8)Ce(0.25)/SiO₂, at 550℃, and a CO₂/EB molar ratio of 20. Moreover, after reaction for 12 h, the V(0.8)Ce(0.25)/SiO₂ still shows stable catalytic activity. The ST yield in CO₂ is higher than that in an inert N₂ atmosphere, showing the significant promoting effect of CO₂ on EB dehydrogenation; this is because CO₂ is a soft oxidant and can effectively keep/regain the high valence of V for high activity with CO₂-ODEB.
- Cerium oxide,
- Supported vanadium oxide catalyst,
- Carbon dioxide,
- Ethylbenzene dehydrogenation,
- Styrene
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Ce Promoter on Catalytic Performance of V/SiO2 in Oxidative Dehydrogenation of Ethylbenzene with Carbon Dioxide

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通讯作者: 陈斌, bchen63@163.com

Effect of Ce Promoter on Catalytic Performance of V/SiO₂ in Oxidative Dehydrogenation of Ethylbenzene with Carbon Dioxide